Note 12 - Fair Value (Detail) - Carrying Value of Level 3 Securities Available-for-Sale (USD $) In Thousands	Jun. 30, 2011		Mar. 31, 2011	Jun. 30, 2010		Mar. 31, 2010	Jun. 30, 2011		Dec. 31, 2010	Jun. 30, 2010		Dec. 31, 2009
Balance at beginning of period			$ 16,193			$ 12,178			$ 14,858			$ 11,728
Total income (loss):
Included in earnings (1)		[1]		(1,049)	[1]			[1]		(3,812)	[1]
Included in earnings (1)		[1]		(1,049)	[1]			[1]		(3,812)	[1]
Included in earnings (1)		[1]		(1,049)	[1]			[1]		(3,812)	[1]
Included in other comprehensive income	294			2,535			1,629			5,748
Included in other comprehensive income	294			2,535			1,629			5,748
Included in other comprehensive income	294			2,535			1,629			5,748
Balance at end of period	16,487			13,664			16,487			13,664
Change in unrealized losses recognized in earnings relating to securities still held at end of period				$ (1,049)						$ (3,812)

[1] Included in Securities gains, net in the Consolidated Statements of Income.